Columbine High School Shootings Fast Facts

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Updated 6:50 PM ET, Sun March 25, 2018

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A woman known only as Golden Eagle pray's next to one of the thirteen original crosses April 20, 2004 that was built and placed in Clements Park next to Columbine High School after the shooting on April 20, 1999.

(CNN)Here is some background information about the deaths of 13 people at Columbine High School in Littleton, Colorado, on April 20, 1999.

Facts:Twelve students and one teacher were killed by students Dylan Klebold, 17, and Eric Harris, 18.

The pair made home videos prior to the attack making references to what they were going to do and apologizing to their parents for it.

Harris and Klebold killed themselves with gunshot wounds to the head in the school's library at approximately 12:08 p.m. on the day of the shootings.

SWAT teams entered the school 47 minutes after the shootings started. Five hours passed before law enforcement declared the school under control.

November 12, 1999 - Mark Manes is sentenced to six years in prison for selling a gun used in the murders to minors Harris and Klebold.

April 2001 - Close to three dozen families of Columbine victims settle suits with the parents of the suspects and gun suppliers. The settlement totals close to $2.5 million. The Harris' and Klebold's homeowners insurance will pay a large part and the rest will come from insurance company payments on behalf of the gun suppliers. The family of victim Isaiah Shoels does not accept the settlement.

August 20, 2002 - The Jefferson County Sheriff's Office settles with the daughter of teacher Dave Sanders for $1.5 million.

June 2003 - Judge Robert Blackburn orders the family of Isaiah Shoels to accept a $366,000 settlement in the lawsuit against the gunmen's families.

August 12, 2003 - The families of victims Daniel Rohrbough, Kelly Fleming, Matt Kechter, Lauren Townsend, and Kyle Velasquez settle a wrongful death lawsuit against parents Susan and Thomas Klebold and Wayne and Katherine Harris, in which the victims' families claim that the suspects' parents should have known what their sons were up to before the shootings. The terms of the settlement have not been released.

October 22, 2003 - Home video of the two suspects is released by authorities. In the video, made six weeks before the murders, the suspects are seen in a forested area shooting at bowling pins.